• 제목/요약/키워드: Hybrid heating

검색결과 196건 처리시간 0.03초

미송 대단면재의 가열법에 따른 진공건조 특성 (Vacuum Drying Characteristics Using Different Heating Methods for Douglas-fir Timber)

  • 정희석;엄창득;소범준
    • Journal of the Korean Wood Science and Technology
    • /
    • 제32권4호
    • /
    • pp.18-26
    • /
    • 2004
  • 변장 14 cm 재장 2.4 m인 대단면재의 전도가열, 고주파가열 및 복합가열에 의한 진공건조특성을 조사하였다. 건조속도는 복합가열에서 가장 컸고, 고주파가열에서 가장 적었다. 비에너지는 고주파가열에서 가장 컸고, 전도가열에서 가장 적었다. 진공건조목재의 횡단방향 함수율분포는 전도가열과 복합가열의 경우 불록한 형태를 나타냈으나, 고주파가열의 경우는 한쪽 표층에서 반대쪽 표층으로 향해 증가하는 경향을 나타내었다. 건조목재의 재장방향 함수율은 전도가열과 복합가열의 경우 횡단면이 중심부위보다 낮았고 고주파가열의 경우 횡단면이 중심보다 높았다. 표면할렬과 횡단면할렬은 전도가열진공건조에서 가장 심하였다. 내부할렬은 어떠한 가열방법에 의한 건조에서도 발생하지 않았다. 복합가열 진공건조 특성은 전도가열과 고주파가열간의 절충된 중간적 경향을 나타냈다.

태양광-풍력 하이브리드를 이용한 철도 선로전환기 융설 장치 구현 (Railway Switching Point Heating System Using the Photovoltaic-Wind Power Hybrid)

  • 김대년;박한얼;김덕현
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 한국신재생에너지학회 2011년도 추계학술대회 초록집
    • /
    • pp.136.1-136.1
    • /
    • 2011
  • This paper proposes the method to implement the railroad switching point heating system using the hybrid of the photovoltaic and wind power. The goal of the implementation of the railroad switching point heating system is to prevent freezing of the snow in the winter. The heating system of railway used to supply electricity through photovoltaic and wind power to prevent freezing. Hot wires of the railroad switching point heating system are used about 2kW of electric energy at the day. The electric energy of 2kW used the length of the hot wires about 3m. As the ON and/or OFF mode considering the tracks temperature and the ambient temperature, so the way the use of power-saving effect. In addition, the system can be used the railroad switching point heating system in winter and railway signal and street lights around the track in summer. In experiment, we acquired the power data according to time at the day of photovoltaic and wind power. We confirmed the temperature rise using the heating cable for 3m of $85^{\circ}C$, 30W/m. The temperature rise of the heating cable changes the temperature of $5^{\circ}C$ after 10 minutes and $11^{\circ}C$ after 10 minutes. We have confirmed the possibility of the railroad switching point heating system using the hybrid of the photovoltaic and wind power.

  • PDF

시설원예용 지열 및 태양열 이용 하이브리드 히트펌프 시스템의 난방성능에 관한 연구 (Study on Heating Performance of Hybrid Heat Pump System Using Geothermal Source and Solar Heat for Protected Horticulture)

  • 전종길;이동건;백이;김형권
    • 한국태양에너지학회 논문집
    • /
    • 제35권5호
    • /
    • pp.49-56
    • /
    • 2015
  • In this study a hybrid heating system based on geothermal source and solar heat was developed in order to save energy for greenhouse heating and its field performance was evaluated. Developed system are composed of following parts: water tank, heat exchanger, heat pump, fan coil unit and heat storage unit. The working performance test was carried out in a greenhouse cultivating oriental orchids being managed by $23^{\circ}C$. Field performance test results showed that average heating coefficient of performance ($COP_h$) was 3.4 for the period from mid-January to mid-March 2013. Heating coefficient of performance ($COP_h$) of developed hybrid heat pump system was more sensitive to water tank temperature than outside air temperature. This study showed that developed hybrid heat pump system has a potential to save the heating costs up to 91% compared to conventional agricultural oil heaters.

콤팩트형 태양열/지열히트펌프 하이브리드 냉난방 및 급탕 시스템 개발 및 성능분석 (The Development and Performance Analysis of Compact Type Solar Thermal/Ground Coupled Heat Pump Hybrid System for Heating, Cooling and Hot water)

  • 백남춘;정선영;윤응상;이경호
    • 한국태양에너지학회 논문집
    • /
    • 제32권5호
    • /
    • pp.59-67
    • /
    • 2012
  • In this study,the compact type solar thermal and ground coupled heat pump hybrid system for space heating/cooling and hot water supply has been developed. This hybrid system was installed in Zero Energy Solar House(ZeSH) in KIER for the demonstration. The thermal performance and operational characteristics of this hybrid system were analysed especially. The results are as follows. (1) This hybrid system was designed in order to address the existing disadvantages of solar thermal/ground coupled heat pump system. For this design, all parts except solar collector and ground coupled heat pump were integrated into a single product in a factory. The compact type unit includes two buffer tanks, an expansion tank, pumps, valves, a controller, etc. This system has an advantage of easy installation with simple plumbing work even in narrow space. (2) The thermal charging and discharging time of the buffer tanks and its characteristics by ground coupled heat pump, and heat pump COP according to geo-source temperature and buffer storage temperature have been studied. This system was found to meet well to the heat load without any other auxiliary heating equipment. (3) The operating hours of the ground coupled heat pump as a backup device of solar thermal can be reduced significantly by using solar heat. It was also found that the minimum heating water supply setting temperature and maximum cooling water supply setting temperature make an influence on the heat pump COP. The lower heating water and the higher cooling water temperature, the higher COP. In this respect, the hybrid system's performance can be improved in ZeSH than conventional house.

대형 Community 건물의 연료전지 구동 복합열원 하이브리드 히트펌프 냉.난방 시스템 성능 해석 (The Study on the Performance of the Fuel Cell Driven Compound Source Hybrid Heat Pump Heating and Cooling System to Large Community Building)

  • 변재기;정동화;최영돈
    • 대한설비공학회:학술대회논문집
    • /
    • 대한설비공학회 2007년도 동계학술발표대회 논문집
    • /
    • pp.82-87
    • /
    • 2007
  • In the present study, the simulation on the annual performance evaluation of a renewable energy systems with fuel cell driven compound source hybrid heat pump systems is applied to the heating and cooling of large community building. The large community building has the economical advantage to apply heat pump cooling and heating systems the long period operation. If air and ground source hybrid heat pump systems are combined, COP of the system can be increased largely. Fuel cell driven compound source hybrid heat pump system can reduced the fuel cost as well as thermal storage tank sharply.

  • PDF

유전가열물질을 코팅한 활성탄소섬유의 휘발성 유기화합물 흡착 및 마이크로파 인가에 의한 탈착 연구 (A Study on Adsorption of Volatile Organic Compound by Activated Carbon Fiber Coated with Dielectric Heating Element and Desorption by Applying Microwave)

  • 김상국;장예림
    • 한국대기환경학회지
    • /
    • 제25권2호
    • /
    • pp.122-132
    • /
    • 2009
  • Adsorption of toluene by activated carbon fiber (ACF) coated with dielectric heating element and desorption by applying microwave were investigated. In order to prepare adsorbent so that VOC can be desorbed by microwave heating, fine dielectric heating element with nano size was coated on the surface of the ACF using hybrid binder. Eight adsorbents (ACF-DHE, Activated Carbon Fiber coated with Dielectric Heating Element) were prepared with different amount of dielectric heating element, kinds of hybrid binder, and solvent. In order to investigate adsorption characteristics, BET surface area, pore volume, and average pore size were measured for each adsorbent including ACF. Breakthrough experiments with toluene concentration, flow rate, bed length using fixed bed reactor were performed to investigate adsorbality of adsorbent, and results were compared with that of the ACF. Desorption reactor was constructed with modified microwave oven to investigate heating effect on ACF-DHE by applying microwave power. Each adsorbent saturated with toluene were put into desorption reactor. Composition of desorbed gas generated by applying controlled microwave power to reactor was measured. Up to now, hot air desorption method has been used. Experimental results showed that desorption method with new adsorbent prepared by coating dielectric heating element on ACF can be used for industrial application.

미세 패턴 가공을 위한 유도가열 및 수냉식 하이브리드 롤에 대한 기초 연구 (A Basic Study on Induction Heating and Water Cooling System Hybrid Roll for Fine Pattern Processing)

  • 조상현;김병인;손영수;윤동원
    • 한국생산제조학회지
    • /
    • 제22권5호
    • /
    • pp.871-878
    • /
    • 2013
  • Roll-to-roll (R2R) hot embossing systems have been developed and are widely used in various industrial domains. These systems press and heat flexible films between a press roll and a back-up roll, as said films pass through the two rolls. In previous studies, a heating roll was used for heating. However, in this study, a hybrid roll for R2R hot embossing is conceptualized and developed. This R2R system can be used for generating fine patterns on large and continuous films. The hybrid roll of our system can cool and heat the films simultaneously, thus affording greater flexibility in process design. Thermal and structural analyses were performed for developing the hybrid roll. In addition, a hybrid roll was designed based on analytical results. Experiments were conducted for measuring the performance of the developed hybrid roll.

건축물 용도별 내부 발열부하에 따른 수열원, 지열원 및 하이브리드 히트펌프 시스템의 에너지 성능 비교 분석 (Comparative Analysis of Energy Performance of Hydrothermal, Geothermal Source and Hybrid Heat Pump System According to Internal Heat Load for Office, School and Smart Farm)

  • 박시훈;민준기
    • 한국지열·수열에너지학회논문집
    • /
    • 제18권3호
    • /
    • pp.19-30
    • /
    • 2022
  • In this study, comparative analysis of energy performance in Taebaek city, a test area, by applying hydrothermal, geothermal source and hybrid heat pump system to office, school and smart farms with different internal heat loads. The conclusion is as follows. In the load characteristics by use of buildings, it was found that office had a large cooling load compared to heating load, school had a large heating load compared to cooling load, and smart farm had only cooling load year-round. Performance analysis of the heat pump system in office shows that the cooling COP of the hydrothermal source is 5.12% and the heating COP is 3.22% lower based on the geothermal source, the cooling COP of the hybrid is 0.41% higher, and the heating COP is the difference in performance appeared sparsely. The performance analysis of the heat pump system in school showed that the cooling COP of the hydrothermal source was 10.44% and the heating COP 3.22% lower based on the geothermal source, and the performance difference between the hybrid cooling and heating COP was insignificant. Heat pump system performance analysis in smart farm only occurred with cooling load. Based on geothermal sources, the cooling COP of the hydrothermal source was 46% and the cooling COP of the hybrid was 19.65%, respectively.

A New Hybird Control Scheme Using Active-Clamped Class-E Inverter with Induction Heating Jar for High Power Applications

  • Lee, Dong-Yun;Hyun, Dong-Seok
    • Journal of Power Electronics
    • /
    • 제2권2호
    • /
    • pp.104-111
    • /
    • 2002
  • This paper presents a new hybrid control scheme using Active-Clamped Class-E(ACCE) inverter for the Induction Heating (IH) jar. The proposed hybrid control scheme has characteristics, which acts as class-E inverter at lower switch voltage and ACCE inverter at higher switch voltage than reference voltage of the main switch by feeding back voltage of the switch. The proposedv hybrid control scheme also has advantage of conventional ACCE inverter such as Zero-Voltage-Switch(ZVS) of the main switch and the reduced switch voltage due to clamping cricuit. Moreover, the proposed hybrid control method using ACCE inverter has higher output power than convenional control scheme since ACCE inverter operates like class-E inverter at low input voltage condition. The principles of the proposed control are explained in detail and the validity of the proposed control scheme is verifed through the several interesting simulated and experimental results.

지열히트펌프 보조열원식 태양열 난방급탕 시스템 작동에 관한 연구 (Study on the Operation of the Solar Heating System with Ground Source Heat Pump as a Back-up Device)

  • 김휘동;백남춘;이진국;신우철
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 한국신재생에너지학회 2010년도 춘계학술대회 초록집
    • /
    • pp.197.2-197.2
    • /
    • 2010
  • The study on the operation characteristics of solar space and water heating system with ground source heat pump (GSHP) as a back-up device was carried out. This system, called solar thermal and geothermal hybrid system (ST/G), was installed at Zero Energy Solar House II (KIER ZeSH-II) in Korea Institute of Energy Research. This ST/G hybrid system was developed to supply all thermal load in a house by renewable energy. The purpose of this study is to find out that this system is optimized and operated normally for the heating load of ZeSH-II. Experiment was continued for seven months, from October to April. The analysis was conducted as followings ; - the contribution of solar thermal system. - the appropriateness of GSHP as a back-up device. - the performance of solar thermal and ground source heat pump system respectively. - the adaptation of thermal peak load - the operation characteristics of hybrid system under different weather conditions. Finally the complementary measures for the system simplification was referred for the commercialization of this hybrid system.

  • PDF